1 files changed, 234 insertions, 0 deletions
diff --git a/js/src/builtin/Reflect.cpp b/js/src/builtin/Reflect.cpp
new file mode 100644
index 0000000000..e2b548b431
--- /dev/null
+++ b/js/src/builtin/Reflect.cpp
@@ -0,0 +1,234 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "builtin/Reflect.h"
+
+#include "builtin/Array.h"
+
+#include "jit/InlinableNatives.h"
+#include "js/friend/ErrorMessages.h"  // js::GetErrorMessage, JSMSG_NOT_EXPECTED_TYPE
+#include "js/PropertySpec.h"
+#include "vm/ArgumentsObject.h"
+#include "vm/JSContext.h"
+#include "vm/Stack.h"
+
+#include "vm/Interpreter-inl.h"
+
+using namespace js;
+
+/*** Reflect methods ********************************************************/
+
+/* ES6 26.1.4 Reflect.deleteProperty (target, propertyKey) */
+static bool Reflect_deleteProperty(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject target(
+      cx,
+      RequireObjectArg(cx, "`target`", "Reflect.deleteProperty", args.get(0)));
+  if (!target) {
+    return false;
+  }
+
+  // Steps 2-3.
+  RootedValue propertyKey(cx, args.get(1));
+  RootedId key(cx);
+  if (!ToPropertyKey(cx, propertyKey, &key)) {
+    return false;
+  }
+
+  // Step 4.
+  ObjectOpResult result;
+  if (!DeleteProperty(cx, target, key, result)) {
+    return false;
+  }
+  args.rval().setBoolean(result.ok());
+  return true;
+}
+
+/* ES6 26.1.8 Reflect.getPrototypeOf(target) */
+bool js::Reflect_getPrototypeOf(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject target(
+      cx,
+      RequireObjectArg(cx, "`target`", "Reflect.getPrototypeOf", args.get(0)));
+  if (!target) {
+    return false;
+  }
+
+  // Step 2.
+  RootedObject proto(cx);
+  if (!GetPrototype(cx, target, &proto)) {
+    return false;
+  }
+  args.rval().setObjectOrNull(proto);
+  return true;
+}
+
+/* ES6 draft 26.1.10 Reflect.isExtensible(target) */
+bool js::Reflect_isExtensible(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject target(
+      cx,
+      RequireObjectArg(cx, "`target`", "Reflect.isExtensible", args.get(0)));
+  if (!target) {
+    return false;
+  }
+
+  // Step 2.
+  bool extensible;
+  if (!IsExtensible(cx, target, &extensible)) {
+    return false;
+  }
+  args.rval().setBoolean(extensible);
+  return true;
+}
+
+// ES2018 draft rev c164be80f7ea91de5526b33d54e5c9321ed03d3f
+// 26.1.10 Reflect.ownKeys ( target )
+bool js::Reflect_ownKeys(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject target(
+      cx, RequireObjectArg(cx, "`target`", "Reflect.ownKeys", args.get(0)));
+  if (!target) {
+    return false;
+  }
+
+  // Steps 2-3.
+  return GetOwnPropertyKeys(
+      cx, target, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, args.rval());
+}
+
+/* ES6 26.1.12 Reflect.preventExtensions(target) */
+static bool Reflect_preventExtensions(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject target(
+      cx, RequireObjectArg(cx, "`target`", "Reflect.preventExtensions",
+                           args.get(0)));
+  if (!target) {
+    return false;
+  }
+
+  // Step 2.
+  ObjectOpResult result;
+  if (!PreventExtensions(cx, target, result)) {
+    return false;
+  }
+  args.rval().setBoolean(result.ok());
+  return true;
+}
+
+/* ES6 26.1.13 Reflect.set(target, propertyKey, V [, receiver]) */
+static bool Reflect_set(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject target(
+      cx, RequireObjectArg(cx, "`target`", "Reflect.set", args.get(0)));
+  if (!target) {
+    return false;
+  }
+
+  // Steps 2-3.
+  RootedValue propertyKey(cx, args.get(1));
+  RootedId key(cx);
+  if (!ToPropertyKey(cx, propertyKey, &key)) {
+    return false;
+  }
+
+  // Step 4.
+  RootedValue receiver(cx, args.length() > 3 ? args[3] : args.get(0));
+
+  // Step 5.
+  ObjectOpResult result;
+  RootedValue value(cx, args.get(2));
+  if (!SetProperty(cx, target, key, value, receiver, result)) {
+    return false;
+  }
+  args.rval().setBoolean(result.ok());
+  return true;
+}
+
+/*
+ * ES6 26.1.3 Reflect.setPrototypeOf(target, proto)
+ *
+ * The specification is not quite similar enough to Object.setPrototypeOf to
+ * share code.
+ */
+static bool Reflect_setPrototypeOf(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+
+  // Step 1.
+  RootedObject obj(cx, RequireObjectArg(cx, "`target`",
+                                        "Reflect.setPrototypeOf", args.get(0)));
+  if (!obj) {
+    return false;
+  }
+
+  // Step 2.
+  if (!args.get(1).isObjectOrNull()) {
+    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+                              JSMSG_NOT_EXPECTED_TYPE, "Reflect.setPrototypeOf",
+                              "an object or null",
+                              InformalValueTypeName(args.get(1)));
+    return false;
+  }
+  RootedObject proto(cx, args.get(1).toObjectOrNull());
+
+  // Step 4.
+  ObjectOpResult result;
+  if (!SetPrototype(cx, obj, proto, result)) {
+    return false;
+  }
+  args.rval().setBoolean(result.ok());
+  return true;
+}
+
+static const JSFunctionSpec reflect_methods[] = {
+    JS_SELF_HOSTED_FN("apply", "Reflect_apply", 3, 0),
+    JS_SELF_HOSTED_FN("construct", "Reflect_construct", 2, 0),
+    JS_SELF_HOSTED_FN("defineProperty", "Reflect_defineProperty", 3, 0),
+    JS_FN("deleteProperty", Reflect_deleteProperty, 2, 0),
+    JS_SELF_HOSTED_FN("get", "Reflect_get", 2, 0),
+    JS_SELF_HOSTED_FN("getOwnPropertyDescriptor",
+                      "Reflect_getOwnPropertyDescriptor", 2, 0),
+    JS_INLINABLE_FN("getPrototypeOf", Reflect_getPrototypeOf, 1, 0,
+                    ReflectGetPrototypeOf),
+    JS_SELF_HOSTED_FN("has", "Reflect_has", 2, 0),
+    JS_FN("isExtensible", Reflect_isExtensible, 1, 0),
+    JS_FN("ownKeys", Reflect_ownKeys, 1, 0),
+    JS_FN("preventExtensions", Reflect_preventExtensions, 1, 0),
+    JS_FN("set", Reflect_set, 3, 0),
+    JS_FN("setPrototypeOf", Reflect_setPrototypeOf, 2, 0),
+    JS_FS_END};
+
+static const JSPropertySpec reflect_properties[] = {
+    JS_STRING_SYM_PS(toStringTag, "Reflect", JSPROP_READONLY), JS_PS_END};
+
+/*** Setup ******************************************************************/
+
+static JSObject* CreateReflectObject(JSContext* cx, JSProtoKey key) {
+  Handle<GlobalObject*> global = cx->global();
+  RootedObject proto(cx, GlobalObject::getOrCreateObjectPrototype(cx, global));
+  if (!proto) {
+    return nullptr;
+  }
+  return NewTenuredObjectWithGivenProto<PlainObject>(cx, proto);
+}
+
+static const ClassSpec ReflectClassSpec = {CreateReflectObject, nullptr,
+                                           reflect_methods, reflect_properties};
+
+const JSClass js::ReflectClass = {"Reflect", 0, JS_NULL_CLASS_OPS,
+                                  &ReflectClassSpec};